System Process - 'Locum' consumes all of my CPU processing Power!

According to this http://hintsforums.macworld.com/showthread.php?t=46048 Locum should only come up when deleting large amounts of files or emptying the trash.

Personally I have never even seen Locum before.

Locum comes up when youe secure empty trash. Finder> Secure Epty Trash. This action phisacly overwrites the files in the trash rather than marking them to be overwritten when the additional disk space is needed. I have force quit Locum multiple times without a problem.

First things first

Emergency backup procedure

Drag and drop copy your users file folders (music, pictures, documents etc) to a regular external powered drive as soon as possible.

Do not use, setup or trust only TimeMachine at this troubled time as it will copy corrupted data and we need just your users files safe just in case. TimeMachine cannot be used with a Windows PC.

Unmount and Disconnect all external drives once the backup process is completed.

Note:

If you have any over 4GB sized files, those won't copy to a standard formatted FAT32/MSDOS drive from the factory, if you need to save these 4GB+ files use another blank/empty drive and use Disk Utility to format it 1 Partition, Option: GUID, Format: OS X Extended Journaled (or the standard default one for older Mac's).

Mac's cannot copy to nor format a NTFS drive. ExFAT format to be used with a Windows machine must be right click formatted by Windows, not OS X (does it wrong) XP macines can install a free exFAT update from Microsoft. Vista-Win 8 can format exFAT.

Formatting a drive will erase all data on it.

Next you can do this for us

Help us to help you on these forums

And start reading this for yourself

Why is my computer slow?

And start doing some stuff here to make sure

..Step by Step to fix your Mac

We will take it from there once I have more information from you 🙂

Finder uses Locum to delete or access files that typically it needs administrator permission to like apps bought from the Mac App Store, rightclick the files in case > get info > sharing and permissions > change read only to read write for everyone.